The Spanish Billionaire's Pregnant Wife: Harlequin comics

Molly is working at an upper-class party when one of the guests starts harassing her. In her position, all Molly can do is politely insist that she's merely a waitress—until Leandro, a Spanish banker and a duke, steps in to protect her. As brave as a hero and as hot as a fallen angel., Leandro invites her to his chambers that night, and she offers him her virginity. But the next morning, he makes her an unbelievable offer: he wants to make her a part of his life... as his mistress!